(navigation image)
Home American Libraries | Canadian Libraries | Universal Library | Community Texts | Project Gutenberg | Children's Library | Biodiversity Heritage Library | Additional Collections
Search: Advanced Search
Anonymous User (login or join us)
Upload
See other formats

Full text of "The manufacture and properties of iron and steel"

200
METALLURGY 03? IRON AND STEEL.
tion of the exposure. , Thus Table XI-F gives examples of slags produced under abnormal conditions; the samples are from an •open-hearth furnace soon after melting, and before an extreme temperature h'ad been reached to" give the carbon of the bath its Ml reducing power.                                                                        •
TABLE XI-F.
Unstable Basic Open-Hearth Slags.
Slag.	Composition., per cent.			
	BiO...	PaOB.	FeO.	SiOa.+PaOB.
1 2 3 4 5 6 r 8	87.53 84.05 82.45 80.26 25.21 20.60 17.31 15.07	2.01 8.08 8.33 5.99 8.34 10.97 16.60 23.06	10.28 18.45 9.36 10.08 11.88 10.90 12.15 10,58	39.54 87.13 85.78 86.25 83.65 81.57 83.91. 88,13
These slags axe selected as instances of high phosphorus for a given silica, and are, therefore, valueless as an indication of what may be expected in practice.. They show, however, that there is no such thing as a critical percentage of silica, since a cinder with S^t per cent. Si02 may hold 2 per cent. P205. The slags in Table XI-G
TABLE XI-GL Normal Basic Open-Hearth Slags.
Slag.	Composition, per cent.			
	SiOa.	P.O..	FeO'.	SiOa.+PaOB.
1 2 3	20.72-,19.04 12,40	6.36 8.24 18.73	16.20 20.16 . 12.60	27.08 27.28 26.13
are -fairer examples of the: results ^.of regular work. In both Tables XI-F and XI-G there is a-column headed- «SiOa+PjOj/J and the constancy of1 this.total under similar conditions-, even with slags of widely • varying character, indicates that the total acid content of the slag is -the measure of its power to absorb phosphorus: • • '
SEC. Xlk.-—EMminatiort of sulphur.—A certain:'proportion of phosphorus-.is likely to be volatilized by the heat and-carried away in the waste gases.. This renders futile any ^*attempts to make ac^